Dinh, 21, played her high school golf at Midland Dow and is heading into her senior season at Wisconsin.

Her first-round 62 was a career-best by seven shots. She made 10 birdies in a bogey-free round.

Dinh, golfing as an amateur, holds a five-shot lead in the 54-hole, three-day tournament over Ashlan Ramsey of Milledgeville, Ga.

Her round beat the previous women's course record by four strokes and beat the best shot by a man on the Mountain Ridge course by two shots.

"I was hitting my irons really well and almost all of my birdies were 10 feet or inside 10 feet," Dinh said in a Michigan PGA press release. "I did chip in for one birdie on No. 12, and I made a 20-footer for one. The hole just looked huge today."

This is Dinh's first tournament of the summer. She is an intern at Dow Corning and is taking two days of vacation and an unpaid day in order to golf in the three-day tournament.

Frankenmuth's Kaitlyn Watkins, coming off her freshman season at Western Michigan, shot a 75 and is tied for 30th.